What would be cool is if he doesn't use guns or gas, and instead the tech "asspull" he uses is something wacky like when Archimedes supposedly built shit like a giant claw to grab and drop ships or a giant mirror to reflect sunlight and burn ships when the Romans were trying to invade Syracuse. As I understand the story, Archimedes was like a one-man army delaying the Romans from landing on Syracuse.
... @Debrandir :
Three ? All this build up already take plenty of chapter ...
And I'm sure even the enemies side lose, they will still attack again ...